Louisville Metro police said with so many vehicles on the road for rush hour traffic, it’s a wonder it wasn’t worse.

As emergency crews rolled over flipped vehicles and began sorting through debris from the crash, police were investigating what led to the fatal accident.

Police said a Nissan sedan collided with a Chevy SUV that was carrying two people.

"Apparently, the Nissan was in the far right lane. At some point she decided to cross over two lanes of traffic, probably to the emergency exit there. It's unclear at this point. But when she did that, the Equinox did strike that Nissan Sentra," said LMPD spokeswoman Carey Klain.

The SUV rolled off the road and into the median.

Police said the driver of the car — a woman in her 60s — died at the scene.

The driver and passenger of the SUV were taken to Norton Hospital.

Southbound Interstate 71 was closed off — backing up traffic all the way into Oldham County.

Heavy northbound traffic moved slowly, clogging things up back to the Watterson Expressway.

"It's fairly close to the Gene Snyder and they were able to stop the cars at that point and round it off and stop it at that point. We had officers blocking the traffic from getting onto the interstate," said Klain.